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forgot the none binding

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svn: r14728

original commit: 82d12675539895d277473b065f6ccb324a2f9775
This commit is contained in:
Eli Barzilay 2009-05-06 04:08:43 +00:00
parent bc668b4652
commit 0cec1f3df9
1 changed files with 3 additions and 0 deletions
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3
collects/framework/preferences.ss
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@ -76,6 +76,9 @@ the state transitions / contracts are:
;; this is used as a wrapped to deal with the problem that different procedures might be eq?.
(define-struct pref-callback (cb))
;; used to detect missing hash entries
(define none (gensym 'none))
;; get : symbol -> any
;; return the current value of the preference `p'
;; exported